In Fig. 43, V=0.2 V and Rvariable =10 Ω. If the current through the sensitive movement is 2 mA

step 1 Applying Kirchap's loop rule is starting at point A and assuming that the current I is moving in

In Fig. 43, V=0.2 V and Rvariable =10 Ω. If the current...

In Fig. $43, V=0.2 \mathrm{~V}$ and $R_{\text {variable }}=10 \Omega$. If the current through the sensitive movement is 2 $\mathrm{mA}$ and the voltage drop across the movement is $0 \mathrm{~V}$, what is the resistance of the thermistor?

Key Concepts

Ohm's Law

Ohm's Law is a fundamental principle in electrical circuit theory stating that the voltage across a resistor is directly proportional to the current flowing through it, with resistance being the constant of proportionality. This concept is essential for calculating unknown values like current, voltage, or resistance in a circuit when the other two parameters are known.

Series Circuit Analysis

Series circuit analysis involves examining circuits where components are connected end-to-end, meaning the same current flows sequentially through all components. This principle is crucial for understanding how voltages are dropped across individual elements and for setting up equations that relate these voltages to their corresponding resistances.

Thermistors

A thermistor is a type of resistor whose resistance changes markedly with temperature, making it useful for temperature sensing and control applications. Understanding the behavior of thermistors is important in circuit design, especially when analyzing how variations in temperature affect overall circuit performance.

Voltage Divider Principle

The voltage divider principle allows for the determination of the voltage drop across components in a series circuit. It is particularly useful when a circuit includes multiple resistive elements, as it provides a method to relate the total applied voltage to the individual voltage drops across each resistor.

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